You don't need to if you defeat Diagla you you cant' see him anymore make sure you have the master ball Cyrus gave you At Galactic headquarters in Velstone City use it to catch Dialga (if you didn't use it already).
You cant, you have to trade him from a Pokemon Diamond game.
you should use if starting with infernape you should use infernape luxaray gyrados dialga staraptor if staring with empoleon you should use empoleon dialga garchomp staraptor drapion and luxaray and starting with torterra torterra staraptor dewgong lucario dialga and drapion
You cant but get Pokemon platinum you can get both dialga and palkia
you cant i tried but after you beat dialga you go to a lake and it says seince you beat dialga and fixed time you cant sorry you cant and my spelling
you cant so sorry only with a action replay : (
only dialga but mime jr is in a different place
A good team combo would be: torterra, infernape, empoleon, dialga, drapion, and staraptor. If you cant do that then do: Golduck, Infernape, Cacturne, Dialga, Vespiquen, and Staraptor. HOPE THIS HELPS! :D
im sorry, but you cant, only in diamond, but if you register the friend code (if you have diamond)you can transfer it ^^
u cant without an action replay
well in Pokemon diamond it can be possible to catch all of them but the easiest ones are dialga,shaymin,mesprit,and the other two lake Pokemon i cant remember the names.
When you get far enough in the game you will get a master ball, dont use it than even further in the game, there he is, that is when you use your master ball, cant miss, hope this help, but if you are to beat this game, you must fight dialga, hope this helped
THE LAST FIVE POKEMON IN THE POKEDEX IN DIAMOND IS UXIE MESPRIT AZELF DIALGA AND PALKIA. NOTE: PALKIA CANT BE CAUGHT UNLESS YOU TRADE WITH SOMEONE.